How to declare private variables and private methods in es6 class [duplicate]

Answer 1

here is a really good post on the subject. I didn't know much about doing this in ES6 before your question but after reviewing this it looks really cool. So you create a symbol that is indexed to the function.

here is the code straight from their sit.

var Person = (function() {
    var nameSymbol = Symbol('name');

    function Person(name) {
        this[nameSymbol] = name;
    }

    Person.prototype.getName = function() {
        return this[nameSymbol];
    };

    return Person;
}());

var p = new Person('John');

Private properties in JavaScript